What is the ratio of Gui Zhi to Bai Shao in Xian Jiang Zhong Tang?

• A. 2:1
• B. 1:3
• C. 1:2 (GZ 9g / Bai Shao 18g)
• D. 1:1

Answer: (C)

A key idea here is how the relative amounts of exterior-releasing and nourishing herbs shape a formula’s action. In Xian Jiang Zhong Tang, Gui Zhi is used at 9 g and Bai Shao at 18 g, giving a 1:2 ratio. That emphasis on Bai Shao means the formula leans more toward nourishing and stabilizing the interior (supporting Yin and Blood) while still allowing some exterior release through Gui Zhi. Gui Zhi opens and warms to release the surface, but Bai Shao’s larger amount counterbalances that action, preventing excessive drying or injury to the yin and helping maintain harmony between the exterior and interior. This 1:2 ratio reflects the intention to harmonize Wei and Ying aspects by combining gentle exterior release with stronger interior nourishment.